CCA 6 releases, which include RPM and Debian packages, are available for download.
This IBM download site contains the license, installation files, readme, release notes, and sha1sum values. Clicking to download an RPM or Debian package means you accept the terms of the LICENSE file which is included in the directory (and in the package).
Note: To access this site, you need to obtain and login with an IBMid. This process is quick and easy. Instructions are on the download site.